Machine tool



Jan. 20,1942. E E, KELLEY 2,270,310

MACHINE TOOL Filed June l, 1938 -4 Sheets-Sheet 1 Jan. 20, 1942. E, E. KELLEY 2,270,310

- MACHINE ,Toon

Filed June 1, 195s I 4 sheets-sheet 2 III/III',

Jan. zo, 1942.

E. E. KEI-LEY MACHINE vTool.

Filed June l, 1958 4 Sheets-Shea?l 3 Z I /7/5 wf /77 ATTORNEY Jan. 20, 1942. E. E. KELLEY 2,270,310

MACHINE ,-TooL Filed June 1, 19:58` 4 Sheets-'sheet 4 Patented Jan. 20, 1942 UNITED STATES PATENT` OFFICE MACHINE Tool.

Elmer E. Kelley, Windsor, Vt. Application June 1, 193s, serial No. 211,229

37 Claims. K `(Cl.` .Z9-53) The present invention relates to improvements infmachine tools and more particularly to machines known as automatic screw machines.

In the operationl of machines of this character usuallyha-ving two or more work rotating spindles, a seriesof operations are performed on the work of each spindle simultaneously. For example,`in ascrew machine having two spindles such as that which forms the embodiment oi the present inventionthe work in the respective spindles may be in different stages ci progress, for instance, one spindle starting a first operation whilethe other spindle has completed the firstoperation and is" starting the second opera- .tionr` Theseoperations may be of any one or groups of the following: drilling, threading, counter-boring, knurling, forming or cutting off, etc., the necessary operations to produce a cer'- `tain` `article 'of manufacture being coordinated in lsuch manner as to produce the article efficiently. This coordination usually requires that the respective spindles be accomplishing operations of` a substantially different nature, the tools for which therefore have appreciably different cutting speeds. In setting up a machine to accommodate such operations, the operator usually chooses a speed for the spindles somewhere betweenthe preferred operating speeds and usually as high as possible to assure rapid production. By operating the machine in this manner, the slow speed tool is operated at an execessive rate which reduces the life of the tool, and the higher speed tool is operated at a speed inadequate for the most eflicient production.

The presentv invention has for its general object, theprovision of an improved machine Aof the character indicated including means whereby the respective work rotating spindles may be driven at variable speeds, the speed of each spindle being suitable to attain maximum operating efciency of the particular tool presented to the Work.

A further object of the invention resides in the provision of an improved automatic screw machine having a pair of spindles, with a-speed change mechanism for driving the spindlesr selectively at variable speeds, and control means for effecting the change in speed of each spindle in timed relation with the mechanism for automatically presenting the different tools to the work.

Another object is to provide an improved speed change mechanism for association with the work rotating spindles of the machine, the improved mechanism affording a simple compact and rugged organization, assuring satisfactory service over an extended period of time.

A still further object `of the invention is to provide improvements in a machine of the type shown in my prior Patent No. 1,892,239, issued December 27, 1932.

Other objects and advantages will hereinafter appear.

With the above and other objects and features in view, the invention will now be described with reference to the accompanying drawings wherein one embodiment which my invention may assume in practice is shown for purposes of illustration.

In the drawings: f Figure 1 is a side elevational view of the machine embodying the invention, portions of the basefbeing omitted;

Fig. 2 is a transverse sectional view through theheadstock of the machine, taken on line 2--2 of Fig. 5;

Fig. 3 is a transverse sectional view taken on line 3--3'of Figure 1 and showing the transverse tool slide assembly;

p Fig. 4 is a sectional plan view taken on line 4 4 of Figure 1, and showing portions of the gear box mechanism and associated turret indexing mechanism;

Fig. 5 is a sectional plan view through the headstock taken on line 5-5 of Figure 1;

Fig. 6 is a longitudinal sectional View taken on line 6--6 of Fig. 5, the parts being shown in elevation;

Fig. 7 is a detailed sectional view, showing the speed change mechanism of, one of the spindles shown in Fig. 5, the clutch being shown disengaged to facilitate illustration;

Fig. 8 is a transverse section taken on line 8--8 of Fig. '7;

Fig. 9 is a fragmentary sectional view taken on line 9-9 of Fig.' 7;

Fig. 10 is a longitudinal sectional View through the gear box, taken on line IO-l 0 of Fig. 4, showing the gear box mechanism and turret slide actuating mechanism.

Fig. 1l is a fragmentary plan view taken on `line II--ll of Fig. 10 showing the turret slide actuating mechanism; l

Fig. 12 is a transverse sectional view taken on line |2-I2 of Fig. 4, showing the turret indexing mechanism in normal inactive condition, and

Fig. 13 is a view similar to Fig. 12 but showing the turret indexing mechanism partly actuated.

A description of the various units of mechanism of the machine shown and described in my prior patent, is hereinafter set forth in some demoved to the rear.

tail, to present a clear understanding of the relation and cooperation of the several units, with my improvements therein, and to bring out the salient advantages obtained thereby.

The embodiment of my invention illustrated in the drawings comprises generally, a headstock I3, a gear box I4 for driving the various units of mechanism, the headstock having a plurality of work rotating spindles I5, the work stock in which are `operated upon by tools carried in a transverse slide I6, or 4other toolsfsupportedin a turret slide I1, by an indexing tool turret I8 thereof; the present invention being directed more particularly to improved means for rotating the spindles I at variable speeds consistent with the work being done by the respective vtools of the tool slide, and/or, the respective tools in the tool turret; the invention being further directedy to provide improved means whereby the speed changes of the spindles I5 are effected in timed relation with the indexing -o'f .the turret carried tools, or the `changing `of the Stools by the transverse tool slide.

-Referring first to the ygeneral-structure of the machine shown in the above patent, the headstock I3 is arranged at one end and the gear box -I4 at the opposite end. A pair -of spindles I5 are rotatably supported by the headstock, and the tool slide I6 is `arranged tomove transversely of lthe machine-to feed tools transversely of 'Work carried by the spindles. Theturret slide `I1 isslidable longitudinally of the machine and carries the tool turret I 8 which is indexed for bringing a tool or tools into position so that they may'engage and disengagethe work carried by the spindles as the slide I1 moves forward and back. The spindles I5 are hollow and are rotatable in bearings 20 of the headstock I3. A central shaft 22 journalled at one end by a bearing .23 in the headstock I3, extends llongitudinallyand is journalled .at its outer endin the gear box I4. It is driven `continuously as will later appear and functions to rotate 4the spindles vat selective speeds in a manner hereinafter described.

The spindle assembles are similar in construction so that but vone will be described in detail. Each spindle I5 includes an outer tube '24 and a ,collet rtube 25 which, as usual is provided with a split Iforward vend forming a collet 26 and which is freely slidable inthe outer tube. A collar A2,1 adjacent Athe rear end of the spindle is provided with ,levers28 pivoted thereto. The collar 21 is carried yby -a 4tubular member 30 secured to the outerlend .of the collet tube 25 and its :rear side isarrangedto abutmember 30. The inner ends of the levers 28 are arranged to bearonthe-end of the spindle tube 24 whilethe outer ends of levers 28 are arranged'tobe acted ,upon by thecurved surface of a cam-or cone 32 .which is slidable on the spindle. As thefcone 32 .moves rearwardly, .the levers are rswung outwardly and their inner endsabuttheend of tube .24 so that the collet tube 25 is,1movedrearwardly 435 whereby its ycollet is contracted so as `to firmly grip a bar of work therein.

v.A feed tube 33 is slidable in the collet tube.25 land :has :a 4split forward .end which is resilient jfor yieldingly embracing vthe work. A Icollar `34 l-7() ,is xed to -the .rear 'end :of the tube :and is engageable by `means to rbe vdescribed `for moving the feed ytubeback and forth. While the collet 26 clamps the work, the yffeed tube 33 may be When the collet 2B Lreleases u the work the feed tube 33, yieldingly gripping the work, will feed the work forwardly.

A tube 35 is journalled at its end in a bearing 36 of the headstock I3 and surrounds shaft 22, being out of contact therewith, and has a gear 31 fixed thereto which meshes with a gear 38 of a shaft 4l) journalled in the walls of the headstock I3. This shaft 46 has a cam drum 4I on its outer end provided with cam pads 42, 43. A follower.44 is slidable on-a guide rod 45, has a projection running into agroove 0f :cone 32 and is engageable by cam pad 42. Another follower 46 slidable on the guide rod 45 is engageable by cam pad 43. A member 41 engaging collar 34 `is also-slidable on the guide rod 45 and a threaded rod 48 extends from the follower 46 and through member 41. A spring 49 between the outer end of rod 48 and member 41 functions so that collar 34 4will be yieldingly urged to the right, and nuts 50 on the rod abut member 41 for opposite actuation. As-thecam drum 4I rotates, it'will move followers 44 and 46so Vthatin proper timed relation, the collet will release or grip the-work, while the feed tube moves forward Vand back to feed the work forwardly of the collet. The tube 35 at its 4end remote from the headstock is rotatable in the gear box I4 and is driven by suitable means therein so that'thecolletsv 26, -and the feed tubes 33' of the spindles are operated in harmony for rotating work, and'for feedingthe Awork at the proper time.

The tool slide I6 just forwardly of the headstock is slidable transversely in ways 52 andis held for sliding movements therein by vgibs 53. Studs at the side ofthe slide haverolls 54 rotatable thereon which are engaged by a cam 55 fixed to the inner end of shaft 40. As the shaft rotates, first one and then'the other ofthe rolls vare engaged by the cam so that the slide I6 Vis reciprocated transversely. Supports for tools 51, 25B and 59 are adjustable in the tool slide I6. These tools may take any form Vdesired depending upon the work to be done on the bars carried by the spindles. Preferably, however, the tools ,will be arranged so'that a certain operation is -being performed on the bar of one spindle while another operation is being performed on the bar of the other. As the tool slide moves in one direction, the tool 59 at one side of .the slide may .bearranged tovcut olf from the bar of one spindle a previously formed piece of work, while some -tool at the other end of the tool slideis-per- .forming a forming operation on the end of the bar of the other spindle.

An indexing tube 6I! surrounds -tube 35 Aand is .preferably out of contacttherewith"except where it is journalled for rotation thereon at opposite ends adjacent the gear box and headstock. This tube 60 is rotated intermittently by the indexing mechanism shown in Figs. 4 and 12, for indexing a stock stop arm 6I xed thereto adjacent the headstock so that the arm may be positioned ,-in front of one Vspindle and then the other and against which theinner end of a barof workvor stock may abut when fed forwardly by a feed tube in a spindle.

The tool turret I8 is also indexed automatically by the mechanism shown in Figure 12, and in timed relation to the other mechanisms of the machine, as will be -hereinafter apparent. The indexing mechanism comprises briey, va rocking indexing arm 62 pivoted at 64 and .has a roller 65 riding in a radial slot 66 of a disk-68 whereby, 'las the indexing arm.62 is rocked 'to the left from the Figure 12 position, turret I8 is rotated one l stopped due to the dwell portion of cam 18 and is thereafter further rotated to complete the half turn; all as described in detail in said patent.

The stock stop arm 6|, Figures 1 and 3, oarried on the indexing tube 68, is normally in an upright position either above the tube or below same, being 'rotated to either of said positions by the indexing mechanism, Figure 12. However, when the said mechanism is in the position shown in Figure 13, the dwell period thence occurring, positions the stock stop arm 6| adjacent one of the Work spindles momentarily so as to limit axial movement of the work rod as same is automatically fed.`

After each indexing movement, the turretslide I1 is moved forwardly towards the spindle and -A carries with it the disk 68. The disk is thus disengaged from the roll 65 on the indexing arm 82, which disengagement permits the indexing arm to be restored `to the position shown in Figure 12, as by means of a counter-weight 14 carried on the arm. Thus, when the turret slide |1 is retracted to its rearmost position, the roll 65 again registers with and engages the opposite portion of slot 66 in disk 68 preparatory to another indexing movement.

The turret slide I1 is reciprocated to and from the work spindles by the mechanism shown most clearly in Figure 11, The turret slide has a slide frame 18 secured thereto which has a block 11 mounted thereon for limited endwise relative to the slide 16. 'Ihe block carries a cam follower or roller 18 disposed in a slot of cam disk 88, the latter being secured to a shaft 8| below the gear box I4 and rotated by the gearing therein. 'This mechanism serves to reciprocate the turret slide I1 in a manner so as to cause same to dwell at each extremity of reciprocatory movement,`the

extent of the dwelling period being variable byI adjustment of the stops 82 associated with the said block and slide frame.

During the time the turret slide I1 is -being reciprocated, the turret I8 is locked thereto by the locking mechanism 84 shown in Figure 10, this mechanism operating to release the turret I8 from theturret slide, as the latter assumes its rearward position, the locking mechanism 84 including a spring pressed bolt 85 slidable in the turret slide I1 and engaging recesses in the turret I8, the bolt 85 being momentarily retracted by cooperation of a lever 88 engaging a trip dog 81; as set forth in detail in said patent.

A general description of the driving mechanism in the gear box I4 will suffice for a clear understanding of the operation of the machine, it being preferred to employ a drive mechanism substantially as shown and described in my prior patent, portions of which are shown in Figures 4 and 10. The drive mechanism of the gear box I4 actuates the various units of the machine heretofore described, preferably from a single rotary drive element or shaft, and including automatic control means and several coordinated drive mechanisms by which the respective units of the machine are operated in harmony one with the other.

l tube 35.

It will be seen from the foregoing, that the shaft'22 constitutes the main drive for the work spindles I5 through change speed gearing hereinafter described; The tube 35 forms the main drive for a collet actuating mechanism and the stock feeding device of the spindles, through the gears 31, 38, shaft 48 and cam drum 4|, and also serves to drive the transversely slidable tool slide I6 by cam 55. Tube 35 also actuates the` turret indexing mechanism by driving the cam 10 thereof. l

The shaft 22 extends through the gear box I4, being journalled in bearing 9| therein. The tube 35 is keyed to the indexing cam 18, the hub 92 of the cam being rotatable in a bushing 93 in the gear box. Tube 35 is driven through planetary gearing 94 which may include a gear `95 having a certain number of teeth and fixed to the gear box I4, and a gear 96 having a different number of teeth than gear 95 and keyed to the A spider 91 is rotatable on the hub of gear 96 and has pinions 98 rotatable thereon and in mesh with gears 95, 96. A sprocket |88 is fixed to the spider 91 for driving the planetary gearing 94. A bevel gear |8I rotatable with gear 96 is in mesh with`a bevel gear |82 carried on the shaft 8| and drives the turret slide reciprocating cam 88. A bevel gear |83 in'mesh with a gear |04, see Fig. 4, drives a cam disk |85 through a shaft |86, the cam serving to control a main drive clutch as hereinafter described.

With reference particularly to Fig. 10, the aforementioned single drive element of the gear box mechanism may be a shaft |88 on which a pulley |89 is fixed for driving said shaft from a suitable power source. The drive for the central shaft 22 may include a sprocket |I2 on the main drive shaft |88 connected by chain to sprocket ||3 on a jack shaft II4, the latter driving the central shaft 22, through al gear train I I5, IIS;`

The drive for the tube 35 may be effected through either a high speed or a low speed train, the desired speed train being selected automatif cally by the cam I 85, see Figure 1, on which cam pads I I8, I I9, are carried and cooperate to oscillate an arm |28 on a rook shaft |2I, to connect or disconnect a clutch |22 by shifting same by a shifter arm |23 and associated lever |24, the arm |23 being xed tothe shaft |2I. i

The low speed train for driving tube 35 may include a chain and sprocket drive |21, driven from the central shaft 22 and operating through a jack shaft |28 which drives a gear train |29, |38, Figure 10, gear |38 being arranged to drive a shaft |3| through an overrunning clutch I 32, the shaft I3| being normally operatively connected to actuate a sprocket |33, connected` by chain to the sprocket |88 which, as afore stated, is fixed to the spider 91 of the planetary gearing 94, see Figure 10.

The high speed train may include a driving sprocket |31 rotatable on shaft |88 and connectible for rotation therewith b-y operation of clutch |22. Sprocket |31 drives a sprocket |38,

the hub of which is keyed to the outer member of the overrunning clutch |32 at one side thereof, and is adapted to drive the sprocket |33 at the other side.

When clutch |22 is engaged, the drive of tube 35 will be at high speed directly through the sprockets |31, |38, and |33, |88, the overrunning clutch |32 permitting sprocket |38 to overrun or rotate faster than the slow speed train. When clutch |22 isV disengaged, by the :action of .cam |05, the high speed train is thus .disconnected and the; low-speed train will, there- :byafsleeve V|44 rotatably carried on shaft |2I.

As shown ,in yFigure l, as a modification of the'toolturret arrangement:shown in Figure 4, the-machine may be arranged so as to rotate the tools carried bythe turret |8 by providingtool yholders'which are `journalled in the turret, one l,ormore of the tool holders having a pinion gear I|46 `fixedthereto and in mesh .with a common drivinggear |41 rotatablymounted; Gear y|41 may be driven by a `counter-shaft `|48 through a .gear train |49, the counter-shaft |48 being preferably actuatedby suitable gearing in a casing II, from the main drive of the machine. The counter-shaft |48 maybe slidably splined to its driving element in the casing I5I so as to accommodate axial `movement of the Ycountershaft during the reciprocatory movement of the 4turretslide `I 1.

Theentire machine set yforth in the preceding description is substantially similar to that shown and described in my'prior patent, a general description of same having been given to bringout the cooperation Vof the improvementshereinafter set Torthytherewith, and the salient advantages obtained thereby.

The improvements herein are directed to-provide a variable speed drive for the work rotating spindles so that the speed of each spindle is that best suited for the particular tool operating on the Work. In machines of this general character,'the tools operating on a certain spindle are automatically changed to accomplish various operations vand the improvements herein are, thereforeiurther directed to-providing an automatic speed change control operative in conjunction with the means by which the tool change is efective,'to synchronize or otherwise coordinate the selection of the spindle speed With the change of the tool.

The speed change mechanism embodying the improvements herein are shown more clearly in Figures 2 and 5 to 9, inclusive. The aforesaid central shaft 22, extending through the headstock I3, has xed thereto a low speed driving gear |55 in mesh with a low speed driven gear |56 ron each of the spindles I5. Central shaft 2:2 Ialso has a high speed driving gear |51 afxed thereto and in mesh with a high speed driven gear |58 on each of the spindles.

The arrangement of the driven gears |56, |58 and associated Velements on the spindles I5 is identical for each of the spindles and is illustrated in detail inFigures 7 and 8. The outer tube 24 of the spindle is shown and has secured thereon a `bushing |60 on which the 10W vspeed gear |56 is rotatably mounted. Gear |56 is formed to provide a concentric recess in which a clutch ring I6I is secured. A clutch body |62 is hired to the outer tube 24, as by a key |63, and includes a radial flange portion |64 disposed in the recess of gear |56, interially of the ring I6I. As shown more clearly in Fig. 8, theflange |64 has'in its periphery, a series of notches, leach notch having a-tangential wall r|66 forming a tapered socket 'I6-1, in v:conjunction with theinterior surface of ring 'I6I. Within each socket -I61 ris disposed a clutch roll '|66 backed by a spring .'I6'9 and adapted to clutch the body |62 and'gear |56 to drive tube'24 as gear |56 is rotatedjin a counter-clockwise direction as viewed in `Figure 8, the rolls |68 being urged toward the tapering end of the .sockets |161 by the springs |69.

A bushing P12-mounts the high speed gear |58 rotatably on the spindle tube 24, a washer |13 abutting an end of the gear |58. A clutch collar |14 having an annular groove |15 is shiftable axially `on the clutch body |62, being mounted for rotation therewith, as Eby a sliding key connection I"16. A complemental clutch member I11 is .fixed to the high speed gear |58 :by a key |18, the clutch collar '|14 yand the clutch member |11 each having a series of teeth |88 engageable with each other by shifting the'clutch collar, to thus provide a positive drive connection between the high speed gear |58 and the spindle tube v24.

.It is desired that the clutch collar I`14fbe yieldably held normally in clutched position with member |11 so that thespindle tube 24 is normally driven through the high speed gear |53. For this purpose a thrust plate |82 is disposed between'the clutch collar |14 and the flange portion |64 of the 'clutch body, in which plate, one or more pins |83 areslidably carried so as to abut clutch collar |14 at one end, the other end being disposed in an aperture of the clutch body |62 and backed by springs |85 therein.

The automatic means by which the clutch mechanism of each spindle I5 is controlled 'to effect a selection of the desired speed in accordance With the operation being performed on the work and intimed relation to the means by which the tools are changed, will now be described `with reference particularly to Figs. 2 and 6. A shaft |86 is mounted transversely of the headstock If3,`beneath the spindles I5 and carries clutch yokes |88, mounted for independent rocking movement, each yoke having fingers |89 riding in the annular grooves |15 of the respective clutch collars |14.

The aforementioned shaft 49 which carries cam drum 4I and cam 55, 'also'has xedly mounted thereon, a cam carrier Wheel IBI having a cam |92 adjustably secured thereto as bymeans of a `T-bolt engaging in an annular T-slot |98 of the wheel. This cam is arranged to engage members |93 each pivotally mounted at |94 on depending arms |95 of the respective clutch yokes I88,`the members |93 being yieldably held in engageable position by appropriate springs '|96 whereby, vin the event that the cam Wheel I9I be reversely rotated, the members |93 may swing cutof the path of cam |92 when engaged thereby, and after being freed by the cam, members |93 will be restored to lnormal position .by their springs |96.

As aforeindicated, 'the shiftable clutchesof the spindles I5 are normally engaged so that the spindles are driven through gears |51, |58 at high speed, such as may be required for a drilling or .cutting oi operation on'the work, as by the tool `61 on the turret I8 and the toolf59 onthe tool slide I6. l

The cam |92 .being revolved'by shaft 48, .approaches and engages one of the members |93 and thereby swings .clutch collar |14 to disengaged position. Theshigh speed gear '556 is thus disengaged from thetube -24 so that the drive of the spindle is now effected by thelow speed gear |56, throughthe overrunning clutch associated therewith. The dwell or flat portion of cam |92 may be of such length as to maintain the low speed drive for an adequate period of time to accomplish the complete operation by the slow speedA tool which `may be either, for example, a forming tool 51, on the tool slide I6, or a threading tool 69`o`n tool turret I8.

It is apparent from the foregoing, in View of the fact that shaft 40 actuates cam |92, that cam `|92 `is rotated in timed relation with the reciprocatory movement of the tool slide I6, in that the shaft. also carries the cam 55 which aotuates the tool slide. It is also apparent, in view of the `relation of tube 35, which actuates the indexing cam 10, with the cam |92, through thetrain of gears 3l, 38, that the automatic selection of the spindle speed is effected in timed relation with the indexing of the tools on the turretl. Since the indexing mechanism determines which of the tools 61, 69 are operable on a particular work spindle, and since the automatic speed selecting mechanism is operated by means having a definite or fixed relation to the indexing mechanism, it will be noted that the changeof speed of the respective spindles I5 is effected in coordination with the change of the tools 61, B9 to each spindle. The same effect is had in reference to the respective tools carried on the tool slide I6 in that the change of these tools relatively to a work spindle is controlled by the reciprocation of the tool slide; from which it will be seen that the speed change mechanism automatically selects a speed for the respective spindles in coordination with the change of the respective tools by the tool slide I6. This assures that each spindle be rotated ata speed best suited to the tool being presented to the work and thereby assures a longer life for the tools, and increases the general efficiency of the machine in that the respective tools may be driven at the maximum speeds desired without sacrificing either the tool or the quality of the work produced.`

' The present application is a continuation in part of my co-pending application, Serial No. 85,130,f`1led June 13, 1936.

While I have in this application specifically described one embodiment which my invention may assume in practice, it will be understood that the same is shown for the purpose of illustration, and that my invention may be modified, and embodied in various other forms without departing from its spirit or the scope of the appended claims. y

What I claim as new and desire to secure by Letters Patent is:

1. In a machine of the character described, in combination, a plurality of work spindles rotatable on fixed axes, a plurality of tools of different character, drive means operable to effect rotation of the work spindles at a plurality of speeds, tool feedingmeans controlling the positions of the tools relative to the spindles whereby the tools operate successively on the work in each of the respective spindles, and automatic means' for selecting said speeds having an operative connection with said tool feeding means.

2. In a machine of the character described, a pair of work spindles rotatable on xed axes, a pair of tools of different character operable on the work of said spindles, driving means oper-` able to effect rotation of the work spindles at either'high or low speed, tool feeding means controlling the positions of the tools relative to the spindles whereby the tools operate alternately on the work in each of the respective spindles, and automatic means for alternately connecting the low and high speed driving means having an operative connection with said tool feeding means, said means having an operative connection with said tool indexing means.

3. In a machine of the character described, in combination, a plurality of rotatable work spindles each rotatable about a fixed axis, means for driving said spindles at high or low speed, a plurality of tools of different character, tool feeding means supporting and controlling said tools to operate successively on the work in each of the respective spindles, and automatictmeans operatively connected with the control means for said tools for selecting said high or low speed in accordance with the character of the tool fed.

4. In a machine of the character described, in combination, a pair of rotatable work spindles each rotatable about a fixed axis, means `for driving said spindles at either high or low speed, a pair of tools of different character, tool indexing means supporting said tools and rotatable to position the latter to operate on the work of said spindles, and automatic means for changing the positions of said tools to operate alternately on the work of each of therespective spindles and simultaneously selecting a high speed or a low speed drive for said spindles.

5. In a machine of the character described having a plurality of non-indexing work spindles rotatably carried thereon, an indexing tool turret adapted to hold a plurality of tools of different cutting speeds, means for indexing said tool turret, a multiple speed driving means for said spindles, including a plurality of actuating trains of different ratios, each actuating train being adapted to impart a forward rotation `to each spindle at a speed corresponding to the cutting speed of the respective tools, and automatic means for connecting a different actuating train to each of said spindles operatively connected with and actuated in timed relation with said indexing means.

6. In a machine of the character described having a pair of non-indexing work spindles rotatably carried thereon, an indexing tool turret` adapted to hold two tools of different cutting speeds, means for indexing said tool turret to present said tools alternately to the work in different spindles, means for driving said spindles including allow speed train and a high speed train, each actuating train being adapted to impart a forward rotation to each spindle at a speed corresponding to the cutting speed of the respective tools, and automatic means for selectively connecting said trains with said spindles, said speed selecting means being operatively connected with and actuated in timed relation with 4said tool turret indexing means.

"7. In a machine of the character described having a plurality of non-indexing work spindles rotatably carried thereon, a reciprocatory indexing tool turret adapted to hold a plurality of tools of different cutting speeds, means for indexing said tool turret to present each tool to the respective spindles, a multispeed driving means'for said spindles including a low speed train and a high speed train, each actuating train being adapted to impart a forward rotation `to each spindle at a speed corresponding to the cutting speed ofthe respective tools, and means having an operative connection with said turret indexing means for selectively connecting said trains with said spindles in timed relation with; said turret indexing means.

8. In a machine of the character described having a pair of non-indexingwork spindles rotatably carriedy thereon, a reciprocatory: indexing tool carrier adapted to hold two tools of'v different cutting speeds, a two speed driving, means, for said spindles including a low speedv train and a high speed train each adapted to impart, a, for.- ward rotation to each spindle at a speed corresponding to the cutting speed of the respective tools, and common driving means having connectionsthereto for automatically indexing said tool carrier to alternately present thev tools to each of the respective work spindles and also having connections for alternately connecting either of said trains with the respective spindles.

9. In a machine of the character; described, in combination, a'pair of rotatableworkispindles each rotatable about a xed axis, meansfor driving said spindles at either high or low speed; pairs of tools of different character, arcarrier for said tools slidable transversely of, said spindles to present the respective tools of #said pairs alter'- nately to the work of each of the respective spindles, means for reciprocating'said toolicarrier, and automatic means operatively-connected with said tool carrier reciprocating means for alternately connecting the high and low speeds of said driving means intimed relation w-ithsaid tool carrier reciprocating means.

10. In a machine of the characterdescribed; in combination, a pair of rotatable worky spindles each rotatable about a fixed axis, means for driving said spindles at either `high or, low speedy a plurality of` tools of different operating speeds, a rotatable tool turret supporting said tools, means for indexing said turret` tozpresent.y each of said tools for operation with'thework of the respective spindles including'a rotatable driving member coaxial withsaid spindle drivingmeans; and automatic means operatively connectedwith said rotatable. driving memberif for selectively connecting the high andlow speedof saidA driving means in timed relation withrsaidpturret indexing means.

11. In a machine ofthe characterA described; in combination, a pair ofrotatable Workspindles, means for driving said spindles at either rhigh `or low speed, pairs of tools of different characten-a carrier for said tools slidable transverselyA of said spindles to present the respective tools of said pairs alternately'to the Work ofz'therespective spindles, means for Areciprocating saidltoolycar.- rier, a second pair of tools ofdiierent operating speeds, a rotatable toolv turret supporting,` said second pair of tools, means fonindexingsaid turretto alternately presenteach tool of said turret for operation with the work of each-of the.l respective spindles, means forY alternatelyconnecting the high and low speed driving means, and a common means for actuating said carrierreciprocating means, said` turret indexing means and said connecting means in harmony.

12. In a machine of the character described, in combination, a pair of rotatablework spindles, means for driving said spindles ateither; high or low speed, a-pair of tools of different: character, a carrier for said tools slidable` transversely of said spindles to present the respective tools of said pairs alternately to the work of each of the respective spindles, means for reciprocating said tool carrier, and automatic meansfor alternately connecting the high and lowl speed driving means including a'. rotatable control. shaft and a cam on said shaft for actuating saidldrive connecting means, said tool carrie-r reciprocating means including a secondI cam onsaid control shaft.'

13. Inv a machine ofY the character described, in combination, a pair of rotatable work spindles, means for driving said spindles, at eitherv high or low speed, a pair of tools vof different operating speeds, a rotatable tool turretsupporting said tools, means for indexing said turret to alternate? ly present each of said tools for operationA with the work of the respective spindlesautomatic means for alternately connecting the. high and low speeds of said spindle driving meansin'cluding a rotatable control shaft and a cam on said shaft, and driving connections between said indexing means and said control shaft.

14;,Al machine of the class described compris.- ingy in combination, a pair of rotatable Work spindles, a drive shaft,.a low speed and aA high speed drive gear on said drive shaft, a set of driven gears normally rotatable on each spindle including a lowA speed and a highspeed: gear in mesh with the respective drive gears, a clutchcn each of said spindles for selectively'and operatively connecting either of said driven gears with its spindle, shifters for actuating said clutches, a control shaft, an actuating member on said controlshaft for operating said Shifters, driving connections` between said drive shaft and said control shaft, a tool carrier slidable transversely of said spindles to present tools of different character carried thereon alternately to the work of the respective spindles, and means actuated from said'control shaft for'operating said tool carrier.

l5. A machine of the class described compris.-

ing in combination, a pair of rotatable'work spindles, a drive shaft, a low speed and a high speed drive gear on said drive shaft, a set of' driven gearsy normally rotatable on each spindle, including a low speed and a high speed gear in mesh` with the respective drive gears,v clutch means on each of said spindles for selectively and operatively connecting either of said driven gears with its spindlesshifters for actuating each of said clutch means, a control shaft,.an actuating member on said control shaftfor alternately operating said Shifters, a rotatable tool turret adapted to'support a pair of tools, means for indexing said turret to alternately present each of the tools for operation with the work ofl the. re-A spective spindles, said-indexing means including a rotatable tube, and drivingr connections between said indexing tube'and said control shaft for concomitantly operating each of said'-y clutch means and indexing said turret.

16. A machine of the class descrfi'bedcompris.- ingin combination, a pair of rotatableworkspindles, adrive shaft, a low speed and ahigh speed drive gear on said shaft, a set of; drivenr gears normally rotatableon each spindle, including-a low speed and a highV speed gear4 in mesh' with the-respective drive gears, an overrunning.' clutch interposed Vbetween each low speed gearand` each spindle, apositive clutchinterposed between each high speed gear and each spindle shiftable: to disable the high speed drive' to` therebyY effect low speed driving of the spindle through said overrunning clutch, means for. alternately shifting said positive clutches; including: a? control shaft, arotatable tool turretladaptedtoA support apair of tools, means .for indexinglsaid turret to alternatelyy present each ofthetoolsfor'opera'- tion` With the work` of the respective spindles;

i saidfindexing means' including a rotatablev tube,

and driving connections between said indexing tube and said control shaft for concomitantly shifting said positive clutches and indexingsaid turret.

17. A machine of the class described comprising in combination, a pair of rotatable work spindles, a drive shaft, a low speed and a high speed drive gear on said drive shaft, a set of driven gears normally rotatable on each spindle, including a low speed and a high speed 'gear in mesh with the respective drive gears, an overrunning clutch interposed between each low speed gear and each spindle, a positive clutch interposed between each high speed gear and each spindle shiftable to disable the high speed drive to thereby7 eiiect low speedvdriving of the spindle through said overrunning clutch, resilient means for yieldably retaining said positive clutches in driving condition, means for alternately shifting said positive clutches in one direction against pressure of said resilient means, said shifting means including a control shaft, a rotatable tool turret adapted to support a pair of tools, means for indexing said turret to alternately present each of the tools for operation with the work of the respective spindles, said indexing means including a rotatable tube, 'and driving connections between said indexing tube and said control shaft for concomitantly shifting said positive clutches and indexing said turret.

18. A machine of the classdescribed comprising, a support, a pair of spindles journalled therein for independent rotation, a single drive shaft, a low speed and a high speed drive gear on said drive shaft, a pair` of driven gears on each spindle including a low speed and a high speed gear which are in mesh with the rstnamed gears and normally rotatable relative to the spindles with which they are associated, and means for selectively and operatively connecting either the high orflow speed driven gears with its respective spindle.

19. A machine of the class described cornprising, a support,a pair of spindles journalled therein for independent rotation, ,a single drive shaft, a low speed and a high speed drive gear on said drive shaft, a pair of driven gearson each spindle including a low speed and a high speed gear which are in mesh with the iirstnamed gears and normally rotatable relative to the spindles with which they are associated, and

vmeans for selectively and operatively connecting either the high or slow speed driven gear with its respective spindle, the said means including a roll clutch associated with each slow speed driven gear and its spindle arranged for driving the spindle from the said gear, a shiftable member on each spindle, and engageable connections between the same and each high speed gear which when in engagement causes the spindle to be driven from said gear rendering the roll clutch inoperative for driving said spindle, the said shiftable members being independently shiftable.

20. A machine of the `class described comprising, a support, a pair of spindles journalled therein for independent` rotation, a single drive shaft, a low speed and a high speed drive gear on said drive shaft, a set of driven gears for each spindle each including a low speed and a high speed gear which are in mesh with the rstnamed driven gears and normally rotatable relative to the spindles with which they are associated, and means for selectively and operatively connecting either one of said driven gears to its respective spindle, said means including a roll clutch associated with each low speed driven gear and its spindle arranged for driving the spindle from said gear, a shiftable member on each spindle and driving connections between the same and the high speed gears which when in engagement cause the spindles to be driven from said high speed gear rendering the roll clutchinoperative, a cam shaft, driving connections between said drive shaft and cam shaft, and means operable by said camshaft for actuating said shiftable members.

21. A machine of the class described comprising, a support, a pair of spindles journalled therein for independent rotation, a single drive shaft, a low speed and a high speed drive gear on said drive shaft, a set of driven gears on each spindle, each set including a low speed and a high speed gear in mesh with the iirst-namedv gears and normally rotatable relative to the spindles with which they are associated, and means for selectively and operatively connecting either one of said driven gears to its respective spindle including clutch members iixed on said spindles, driving means associated with said clutch members and low speed gears whereby the spindles are driven in one'direotion at low speed, shiftable members on each spindle, driving connections associated with said members and the high speed driven gears which when engaged cause the spindles to be driven by the high speedgears at high speed in said one direction rendering the low `speed driving means inoperative.

- 22. A machine of the class described comprising, a support, a pair of spindles journalled therein for independent rotation, a` single drive shaft, a low speed and a high speed drive gear on said drive shaft, a set of driven gears on each spindle each set including `a low speed Aand a high speed gear in mesh with the rst-named gears and normally rotatable relative to the spindles with which they are associated, and means-for selectively and operatively connecting either one of said driven gears to its respective spindleincluding clutch members xed on said spindles, driving means associated with said members and the low speed gears whereby the spindles may be driven in one direction at low speed, independently shiftable members one on each spindle, engageable driving connections associated with said shiftable members and the high speed driven gears which when engaged cause the spindles to be driven by the high speed gears at high speed in said one direction rendering the low speed driving means inoperative, and means to operate said shiftable members independently of oneanother.

23. A machine of the class described comprising in combination, a support, a pair of hollow spindles journalled therein for 'independent rotation, a pair of gears consisting of low` and high Vspeed driven gears associated with each of said spindles, a single drive shaft, a low speed and a high speed drive gear thereon meshing with the said low and high speed driven gears, recesses in said low speed driven gears, clutch bodies fixed on said spindles, clutch means associated with the bodies and recesses arranged and adapted for operative engagement whereby the bodies and spindles are rotated at one speed in one direction by the low speed driven gears, shiftable members relatively non-rotatable on said spindles, engageable members associated wlthxthe` highxspeedidriven gears and shiftable members` arranged for engagement'. when the shiftable members are. ini high. speed positions whereby the spindles are driven by the said high, speed driven gearsat arelatively faster speed to render the clutchzmeans'inoperative for driv ing the spindles.

` 24'. A machine ofthe class described compris'- ing: inv combination, a support, ai pair of hollow. spindlesv journalled therein for independent 1 rotation, a setofgears consisting of low and high speed driven gears associated with, each. ofl said spindles, a single driveV shaft, a low speed' and a high speed drive gear'rotatable thereon meshing with the saidlow andl high speed gears, recesses in saidlow. speed driven gears, clutch bodies and recesses: arranged and adapted'for engagement' whereby the bodies and spindles may be rotated at one speed and in one direction by: the'low. speedL driven gears, shiftable members relatively non-rotatable on each ofA said spindles, engageable members associated with thehigh speed` driven gears and shiftable members arranged for engagement when the shiftable members are in high speed positions whereby the spindles are driven by the said high speed,y driven gears at arelatively faster speed to render the clutch means inoperative for driving the spindles, and means for shifting the shiftable members including movable yokes one for eachv spindle-acting on the shiftable members. and' a common means `for. actuating said yokes.

25. A. machine ofthe classl describedcomprising in combination, a support, a pair of hollow` spindles journalled therein for independent rotation, aset of gears for each spindle each including'a high and a low speed gear relativelyrotatable on theirI respective spindle, a single drive shaft, a single low speed anda single high speed drive gear thereon meshing with` the low and highspeed gears, a shiftable member slidable on and operatively engaging each spindle, clutch means: associated with each shiftable member and adjacent low speed driven gear which when engaged with the shiftable'member in lowspeed position causes the spindle to-be drivenat low speed' from the low speed drive gear, engageable means associated with the shiftable members and high speed gears which whenv engaged cause the high speed driven gear to be driven from the single high speedkr drive gear, the said; clutch means and engageable means being arranged whereby either the high or lowy speed: driven gear on each spindle is connected to thev drive gears,` a driven shaft operatively connected to the drive shaft, Shifters mounted for independent movements on saidsupportioperatively connected to the shiftable members, andmeans for actuating said shifters including a member rotatable with the driven shaft alternately engaging the said shifters.

26. A machine of theclass described comprising in combination, a support, a pair ofV hollow spindles journalled therein7 for independent rotation, a rotatable shaft having a cam drum thereon controllingfeeding of barstock through said spindles, a set of gears for each spindleeach including a high and a` low speedfgear, said low speed gears being relativelyrotatable onithe respective spindles, a single drive shaft, a' single low speed and a single high speed drive-l gearV thereon meshing with the low and high speed gears; a shiftable member slidable on and op'- eratively engaging eachv spindle, shifters -mountassaggio ed, for independent movements on said support and.v operatively connected to the shiftable` members, and'. means for actuating the Shifters, the said means including a member rotatable with the drum; shaft and members movable on the shifters into` and out of the path of movement of said member adapted to be operatively engagediby said .member only when the drum shaft rotates-in one direction.

27; In aimachine of theV class described, separate rotatable spindles, engageable clutch members, independently. shiftable clutch operating members, a, rotatable drum shaft, an actuator thereon, members on the operating members shiftable'into and out of the path of movement of the actuator adapted and arranged to be moved out ofsaid path bythe actuator as it rotates in one direction and' engaged thereby when the actuator operates in another direction.

28i In a machine of the character described, a rotatablespindle, a two speed power transmitting mechanism for driving said spindle and including a lowspeed train and a high speed train, the driven element of each train being carried onl said'V spindle, and means for selectively connecting. either of said trains with said spindle comprising an overrunning clutch associated withk said? low speed train and a drive clutch slidable on said spindle between the driven elements of each train, normally in condition to drive said spindle through said high speed train and adapted upon actuation to disable said high speed train whereby said spindle is driven through the low speed train.

29. Ina machineof the character described, a work spindle rotatable on a fixed axis, a low speed gear and a high speed gear operatively carried on said spindle and spaced axially from each other, said low speed gear including an overrunning clutch, a clutch collar slidably carried on said spindle between said high and low speed gears to rotate with said spindle, andmeans for yieldably holding said collar normally clutched with said high speed gear, said collar being slidable on said spindle against the power of said yieldable holding means to release said high speed gear from said spindle.

30. In a machine of the character described, a spindle rotatable on a fixed axis, a low speed gear and a high speed gear operatively carried on said spindle and spaced axially from each other, said low speed gear including an overrunning clutch having a body portion fixed to said spindle, a clutch collar slidably carried on said body portion to. rotate therewith and normally clutched with said high speed gear, and a spring backed by said body portion and acting upon said clutch collar to yieldably hold same in engagement with said high speed gear.

3l. In a machine of the characterV described, a spindle rotatable on a fixed axis, a low speed gear and a high speed gear operatively carried on saidf spindle and spacedy axially from each other, said low speed gear including an overrunning clutch having a body portion fixed to said spindle and a flange disposedy to rotate within said low speed gear and having apertures therein, a clutch collar slidably carried on said body portionto rotate therewith and normally clutched with said highspeed gear, and springs within saidange apertures acting upon said clutch collar toV yieldably hold same in engagement with said high speed gear.

32. In amachine of the. character described,

a pair of Work spindles rotatable on fixed axes, a tool slide movable transversely to the axes of said spindles having tools thereon in position to act on the Work held in said spindles, a second tool slide movable longitudinally of the axes of said spindles having tools thereon movable into engagement with the Work held by said spindles, operating mechanism for operating said tool slides, drive means for rotating said spindles normally at a high speed including a drive shaft having a high speed gear and high speed gears on said spindles driven thereby, drive means for rotating said spindles at a lower speed during engagement of certain of the tools on said movable slides including a low speed gear on said drive shaft and low speed gears on said spindles driven thereby, and clutch means for selectively connecting said high and low speed drives.

33. In a machine of the character described, a series of rotatable Work spindles, means for driving said spindles at either high or low speed, a rotatable turret supporting tools of different character, means for indexing said turret to present different tools for operation on the work in each of the respective spindles, and automatic means for selectively connecting the high and loW speed spindle d-riving means to said spindles having an operative connection with said indexing means.

34. In a machine of the character described, a pair of Work spindles rotatable on fixed axes, a drive shaft, driving connections for driving vsaid spindles at either high or low speed including high and low speed driving gears on said shaft and high and low speed gears on said spindles driven thereby, overrunning clutch means in said W speed connection enabling said spindles to be driven at high speed by said high speed connection, and clutch means in said high speed connection for establishing and interrupting said high speed drive.

35. In a machine of the character described, a plurality of Work spindles rotatable on Xed axes, a drive shaft, driving connections for driving said spindles at either high or low speed including high and low speed driving gears on said shaft and high and 10W speed gears on said spindles driven thereby, overrunning clutch means in said low speed connection enabling said spindles to be driven at high speed by said high speed connection, clutch means in said high speed connection for establishing and interrupting said high speed drive, tool feeding mechanism for advancing high and low speed cutting tools into engagement with the work in said spindles, and means for automatically controlling said clutch means to establish said high speed drive When said high speed cutting tools are operating on the work in said spindles and interrupting the same when said low speed cutting tools are operating thereon.

36. In a machine of the character described, a pair of work spindles rotatable on xed parallel axes, a drive shaft between said spindles, driving connections for driving said spindles from said shaft at either high or low speed including a high and a 10W speed pinion on said shaft and a high and a low speed driven gear on each spindle, overruning vclutch means in said low speed driving connection enabling said spindles to be driven at high speed by said high speed pinion, and clutch means in said high speed connection for establishing and interrupting said high speed drive.

37. In a machine of the character described, a pair of Work spindles rotatable on iixed parallel axes, a tool slide movable transversely to the axes of said spindles having tools operating simultaneously on the Work held in said spindles, a second tool slide movable longitudinally of said spindles having tools thereon movable into engagement with the Work held in said spindles, operating mechanism for operating said tool slides, a drive shaft, high and low speed driving gears on said shaft and high and low speed driven gears on said spindles driven thereby, and means controlling said connections for enabling said spindles to be driven at high speed when said transversely movable tools are in engagement with the work in said spindles and at low speed when said longitudinally movable tools are in engagement therewith.

ELMER E. KELLEY.

cERTiFiCATE or CORRECTION. Patent No. 2,270,510. January 20, 19m.

ELMER E. Kamm.

v It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows; Page 5 first column, line MO, after "endvvise" insert --movement--g page 5, second column, lines 6 and Y, claim 2, strike out said means having an operative connection with said tool indexing means" page 6, second column, line 14.5, claim l5, for "spindles" read -spindle; that the said Letters Patent mould be read with this 4correction therein that the same may conform to the record of the oase in the Patentv Office. l

Signed and sealed. this 51st day of March, A. D. l9h2.

Henry Van Arsdale,

(Seal) Acting Commissioner of Patents 

